TM 5-6675-323-14
f.
Move optical mount from upper limit to lower limit, and observe
c h a i n movement.
If chain jumps sprockets, it is too loose. If
optical mount does not move smoothly, chain is too tight.
Readjust,
if
necessary.
g.
h.
Mount stereoscope.
U s e Z-axis coarse feed knob to move optical mount up and down.
i.
Observe movement.
CAUTION
Remove stereoscope before readjusting chain; weight of stereoscope may
c a u s e mount to drop and damage viewing stages.
j. Remove stereoscope.
k.
Readjust
chain, if
necessary.
l.
T u r n power on.
6-20.8 Replace Dimmer Circuit Card.
MOS: 41B, Topographic Instrument Repair Specialist
TOOLS :
5/32 in. Offset Flat Tip Screwdriver
9/64 in. Flat Tip Screwdriver
S U P P L I E S : Dimmer Circuit Card
H e a t Sink Compound (Item 13, Appendix E)
6-68
